No, they aren't always visible. It depends if its heterozygous or homozygous.
Homo- 2 of the same gene. Ex. RR or rr
Heter- both genes are different. Ex Rr
Genes, i think... but if its right comment here and gimme a thanks homie;)
Answer:
The Moon's gravity pulls more on the planet than the water on the opposite side. These two water bulges on opposite sides of the Earth aligned with the Moon are the high tides. Since ocean water is pulled higher in the areas of the two high tides, there is less water in between the two high tides.
Explanation:
The reason is that of the significance of the brain in human existence. In biology, the traits that provide an advantage in the environment are preserved and improved upon. Therefore, as humans continue to use their brains to influence their environment, as the society rewards those with higher intelligence (associated with bigger brains),the bigger brains will be favored by natural selection.
